I am experiencing an odd behavior with one of my mining setups. I am running a single Sapphire HD7970 in this machine with Windows 10 and Radeon Crimson drivers v17.4.2, and am getting an inconsistent hash rate. I am To clarify this further; immediately after a computer restart and initiating Claymore miner v12.4 i can obtain somewhere in the region of 270H/s to 300H/s. After an inconsistent period of time that ranges from approximately 30mins to 1h30mins the rate will suddenly plummet to about 180H/s. From what i can see this appears to be due to the activity of the GPU (please see screenshot) - it is visible where the card is idle till Claymore miner is started (roughly 98%) and then shortly after it tails off to about 78%. It appears that it is irrelevant whether the card is overclocked or not because the issue happens regardless.
What i can’t work out is what is triggering this change. Has anyone else experienced this issue and/or does anyone have a fix for it?
Thanks in advance.